Picture frame



FIG. 1 is a front elevation of the picture frame, showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a left side elevation thereof, the right side being a mirrorimage.

The ornamental design for a picture frame, as shown and described.